Railway truck



Aug. 23, 1938. H, M. PFLAGER ET AL 2,127,935

RAILWAY TRUCK Filed Aug. l2, 1955 3 Sheets-Sheet l Aug. 23, 1938. H. M. PFLAGER ET An. 2,127,935

RAILWAY TRUCK Filed Aug. 12,'1935 3 Sheets-Sheet 2 Aug. 23, 1938. H, M. PFLAGER ET Al. 2,127,935

RAILWAY TRUCK Filed Aug. 12, 1935 3 SheetS-Shee 5 Z'm/en for Patented Aug. 23, 1938 'UNITED STATES PATENT IGFFICE RAILWAY TRUCK Application August 12,

14 Claims.

This invention relates to railway rolling stock and consists in novel truck structure.

The main object of the invention is to provide a light weight truck particularly adapted for 6 high speed service.

Another object is to dissipate minor lateral shocks applied to the truck frame when the wheels strike rail joints, switches, and other irregularities in the track producing jiggling of the frame.

vAnother object is to support the bolster hangers from the truck frame by rubber members and, preferably, to arrange the members so that their resiliency is not limited' to merely resisting l5 compression forces.

A copending application, Serial No. 17,415, filed April 20, 1935, by one of the present inventors illustrates a light weight truckfor high speed service in which three sets of springs are provided to produce easy riding qualities, namely,

those carried from the journal boxes and directly supporting the truck frame, those seated on the frame transoms and pivotally supporting the bolsters, and those between the hangers and the bolster. The sets of springs have different char` acteristics so as to have a mutually dampening eiect.

In the present invention, the springs directly supporting the bolster hangers are replaced by rubber resilient members which provide new and useful means for resiliently supporting the swing hangers.

In the accompanying ldrawings illustrating the invention- Figure 1 is a partial top view of a truck embodying the invention.

Figure 2 is a partial side view of the structure in Figure l.

Figure 3 is a vertical transverse section on the une a-s or Figure 1.

Figures is a half vertical longitudinal section and side view taken substantially on the line 4-4 of Figure 1 but showing an end portion of 5 the truck.

Figure 5 is a detail horizontal section taken on the line 5--5 oi Figure 3.

Figure 6 is a detail vertical longitudinal section taken on the line 6--6 of Figure 1.

ing a modication.

Figure 7. is a view similar to Figure 6 but show- 1935, serial No. 35,710

(c1. 10s-19o) Figure 10 is a vertical transverse section taken on line Ill-I0 of Figure 9.

Figures 1 to 6 show a. truck including aA pair of wheeled axles I, journal boxes 2 and equalizers 3 mounted on the boxes and supporting the truck framing by means of coiled springs 4. The truck frame comprises side members or whieel pieces 5 and box section transoms 6. Brake hanger brackets 1 and 8 are provided at the ends of the side members and at the intersections of these members with the transoms.

Each end of each transom is recessed to form an enclosure which houses two pairs of rubber members I5. Each member I5 is vulcanized to plates I6 on the opposite sides thereof. Shoullders 24 on the transom Iside walls I4 seat the rubber members. A yoke or hanger support includes elongated vertical ribs I8 extending over. the two pairs of rubber members I5, horizontal Webs 35 between the corresponding ends of ribs I8 and overlying the rubber members, and depending vertical Webs I'I each inserted between a corresponding pair of rubber members I5.

A pin I9 seated in ribs I8 pivotally mounts a swing hanger I0 depending between members I5 and through an opening 20 in the bottom of the transom. Lugs 2| projecting from one oi' Yribs I8 mount a bolt 22 securing pinJ I9 in position. Hanger I0 at its lower extremity has a slot 23 receiving the end of a bar II supporting the elliptic springs I2 von which the bolster 9 is carried.

The sides of webs I1 converge downwardly as do the abutting inner plates I6 on the rubber members. The lower faces of these members are inclined upwardly and toward each other to provide for downward deection of the rubber, when the load is applied, without excessive amounts of rubber projecting below the level of the lower edge of the outer plates I6. Shi'ms 36 are provided between the horizontal Webs 35 and the upper, inner edges ofthe rubber members or the upper edges of the inner plates I6.

In assembling these parts, downward pressure on the hanger produces a wedging action between webs I1 of the hanger yoke and the abutting inner plates I6 on the rubber members, and

the webs slide downwardly relative to the inner plates of the rubber and apply horizontal compressive force on the rubber until the shim engages the upper inner edges of the inner plates I6.

It is a characteristic of rubber that if it is put under compression it will have less deflection under a given load and thereby oiler greater resistance to other forces applied thereto. The

shims are used to adjust the component of compression so as to provide proper deflection.

'If the resiliency and other qualities of the rubber is lessened, due to constant use or other reasons, the proper resistance to the vertical and transverse displacement of the hanger may be -to shearing, bending, and twisting forces, resulting in freer action of the rubber than would be the case if the members were mounted on a horizontal member of the transom4 with the hanger top bearing member or the hanger itself supported on top of the members, thus subjecting and to tend to dampen the effect of the bolster the members principally to compression forces only.

Figure 7 shows a web 26 of a hanger yoke similar to thatin the previous form but the sides of web 26 and the abutting inner plates 21 on the rubber members 28 are disposed vertically. Shims 39 are provided between the portions 26 of the yoke and the inner plates of the rubbermembers 28 to adjust the component of compression on the rubber members. To facilitate assembly of the yoke between the rubber members, the lower portion of the yoke web is' beveled at 40. Shims 38 are provided between the shoulder on the bearing member and the upper edges of the inner plates so asto adjust the height of the swing hanger in the truck. l

In Figures 8 to 10, each bolster hanger 29 is supported directly by the rubber members 30 without the interposed bearing device of the previous forms. Hanger 29 has a downwardly tapered upper portion 3l against the sides of which abut the similarly tapered inner plates 32 on members 30. The rubber members are positioned between shoulders 33 on the transom side walls, and shoulders 34 at the upper end of the hanger overlap the upper edges of the rubber members. vFillers or shims 35 provide for adjusting the component of compression on the rubber members in the same manner as the shims in Figures 1 to 6. In this form the rubber members are twisted by swinging of the bolster hangers, the members yielding under the torsional forces applied through the hangers. Y f

'Ihe rubber members function to carry the vertical load on the truck, to absorb the lateral shocks due to the jiggling of the truck frame when the wheels strike rail joints, switches, etc.,

springs I2 and frame supporting springs 4 so that the truck rides smoothly and evenly. In Figures 8 to 10, the rubber `members have athird function, to twist and offer approximately the same lateral resistance as that obtained by the `usual inclined swing hanger. In all forms, the bolster is effectively centered due to the resistance to swinging which gradually increases as the bolster is displaced from its center position.

The invention is not limited to the details shown but may be modified as will occur to those skilled in the art and the exclusive use of all those modifications coming within the scope of the claims is contemplated.

What is claimed is:

1. In'a railway truck, framing, rubber members thereon, elements between said members, said members being compressed horizontally between said framing and said elements to support the latter, hangers carried by said elements, and a bolster carried by said hangers.

2. Structure as specied in claim 1 in which said hangers are pivoted on said elements.

3. In a railway truck, framing having upright opposing elements, individual rubber members independently mounted on said elements and having substantially parallel opposing faces, and a bolster support device between and compressing said rubber members and yieldingly carried thereby, said support device having downwardly converging parts engaging opposing faces of said rubber members for adjusting the compression of said rubber members.

4. In a railway truck, framing with opposed substantially parallel walls, rubber members mounted on said walls, and a bolster supporting device carried by said members and including a portion between parts of said members spaced from said walls and compressing them laterally against said walls, such compression increasing with the load on said device, said device being Lnovable horizontally by distortion of said memers.

5. In 'a railway truck, spaced transverse frame elements, rubber members at the opposite ends of said elements, said members being arranged in pairs, support devices between and compressing the members of each pair horizontally, hangers pivotally suspended on said devices, and a bolster carried by said hangers.

6. In a railway truck, spaced pairs of rubber members, a device having spaced elements gripped between opposing faces of each pair of said members, and a bolster hanger pivotally carried by said device and swinging between said elements and between said pairs of members.

'7. In a railway truck, opposing parts with shoulders spaced vertically and horizontally from each other, rubber members mounted on said parts with outer portionsrengaged by said shoulders, and bolster swing hanger structure carried by the inner portions of said rubber members, said shoulders functioning to hold said rubber members against movement horizontally or vertically by said hanger.

8. In a railway truck, a frame member'having a recessed portion, separated rubber members housed therein and mounted on opposite walls of said portion, and a bolster hanger between said members and depending through said frame member.

9. In a railway truck, horizontally opposing parts, separated members mounted on said parts and extending therefrom towards each other, a device supported by said members, and a bolster hanger element carried by said device between the inner portions of said members, said members being compressed between said parts and said device and the compression on said members being increased with the load on said element.

'10. In a railway truck, opposing parts, rubber Imembers mounted on said parts, and a bolster hanger secured between and suspended from said members, said members beine. torsionally resilient hanger element for adjusting the compression of said rubber members.

12 Structure as specified in claim 10 including iiiier means between said rubber members and said hanger for adjusting the component of compression on the rubber members to vary the resistance of the rubber members to deflection, shearing, bending, or torsional forces.

13. In a railway truck, a frame having upright walls spaced apart, rubber members independently mounted on said walls and extending towards each other, a device gripped between said rubbermembers, a bolster swing hanger pivoted on said device, said hanger being yieldingly supi ported on said frame by the iiexing of said rubber members.

14. In a railway truck, a frame, spaced rubber members seated on said frame at each side of the truck, devices at each side of the truck each extending between and carried by adjacent rubber members and movable transversely of the truck by the yielding of said members, swing hangers carried by said devices, and abolster car- 10 ried by said swing hangers.

H. M. PFLAGER. Y EDMUND S. BECKETI'E. 

